I believe the correct answer was grain, as Egypt was known for its healthy fields near the mile and delta rivers.
<span>carved out several east-to-west trails that helped settlers move west</span>
Answer: In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.